Firefox slow to react

Hello

My OS is Windows Vista and I used Firefox for several years with virtually no problems, but in recent months, from 14 of Firefox (or 13?), it is now very, very slow.
I use ADSL (broadband) connection with a speed of 6-8 Mbps and the response time for Firefox is now around 120ms and receiver speed approximately 0.6Mbit / s. sending is normal, however, with about 0.89Mbit / s. I also Netscape Navigator 9 and Explorer, and they are always fast, 7Mbit/s and 0.89Mbit / s (receive and send) and a response time of about 15ms.
What I did to solve the problem? That's what I tried:

-Search of viruses and Trojan horses
-Safe mode.
-No add-on.
-No plugins.
-Without bookmarks.
-Deleted the cache and history.
-Update of the modules and plugins.
-Close antivirus and firewall.
-Reinstalled with the Firefox button in the Help menu.
-Do a complete reinstallation after you remove all profile etc.
-Changed DNS servers.
-J' tried everything: config and change the values

Yesterday I installed Comodo IceDragon, which is almost identical to 15 of Firefox, and suddenly, the speed has been 7/0.89Mbit/s but, alas, only once for the Dragon and once for Firefox. Then back to normal 0.6/0.89Mbit/s.
Is there something more I can do? Ways to keep in mind that Netscape and explore work perfectly and I do not receive the error messages.

Thanks in advance!

Lars Ahlberg
Sweden

Poor performance in Flash-based speed tests may be related to conflicts of the add-on and some features of Flash. If you have not already tried these:

(1) disable protected mode (Win Vista and Win 7 only)

See this article from Adobe support under the heading of 'Last resort': Adobe Forums: how to fix protected Flash Player for Firefox mode?

(2) disable graphics hardware acceleration in Firefox and Flash

(A) in Firefox, uncheck the box here and restart:

Orange Firefox button or classic menu Tools > Options > advanced > General > "use hardware acceleration when available.

(B) in Flash, see this article from Adobe technical support: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues

(3) for graphics problems, make sure your RealNetworks modules are the latest versions

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